VPT100+2800S Series
DS90220B
11314 4th Avenue
West, Suite 206
Everett, WA 98204
http://www.vpt-inc.com
Sales Information:
Phone: (425) 353-3010
Fax: (425) 353-4030
E-mail: vptsales@vpt-inc.com 1
HIGH RELIABILITY
COTS DC-DC CONVERTERS
DESCRIPTION
The VPT100+ series of isolated COTS DC-DC
converters is a cost effective solution for many
demanding high reliability applications. A wide input
voltage range accommodates nominal 28V inputs
including avionics, mobile, ground systems, and
other applications. A high efficiency design using
synchronous rectification reduces input power
requirements and eases thermal management. Low
input and output ripple, fixed operating frequency,
current sharing capability, and companion EMI filters
simplify system design and compliance. A proven
design heritage, no optoisolators and a rugged all
metal package ensure long term reliability.
The VPT100 series is intended for harsh
environments including severe vibration, shock and
temperature cycling. Testing is to JESD22, MIL-STD-
810, and MIL-STD-883.
These converters are designed and manufactured in
the USA in a facility certified to ISO9001, J-STD-001
and IPC-A-610.
This product may incorporate one or more of the
following U.S. patents:
5,784,266
5,790,389
5,963,438
5,999,433
6,005,780
6,084,792
6,118,673
FEATURES
• High Reliability at Low Cost
• Parallel Up to 5 Units With Current Sharing
• Up to 100 Watts Maximum Output Power
• High Efficiency, Up to 91%
• Wide Input Voltage Range: 16 to 40 Volts per
MIL-STD-704 and MIL-STD-1275
• High Input Transient Voltage: 50 Volts for 1 sec
• Input Undervoltage Lockout
• Fixed Frequency
• Output Voltage Trim (+10% / -20% )
• Fast Startup time with Soft Start
• Current Limit Protection
• Short Circuit Protection
• Magnetic Feedback, no Optoisolators
• Wide Temperature Range, -55°C to 100°C
• Six Sided Metal Rugged Enclosure
• Meets MIL-STD-461C/D/E Conducted
Emissions Requirements When Used With a
VPTF series EMI Filter
Figure 1 – VPT100+2800S Converter
(Not To Scale)
VPT100+2800S Series
DS90220B 2
SPECIFICATIONS (TCASE = -55°C to +100°C, VIN = +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous) 40 VDC Junction Temperature Rise to Case +17°C
Input Voltage (Transient, 1 second) 50 Volts Storage Temperature -55°C to +125°C
Output Power1 100 Watts Lead Solder Temperature (10 seconds) 300°C
Power Dissipation (Full Load, TCASE = +100°C) 18 Watts Weight (Maximum) 76 Grams
VPT100+283R3S VPT100+2805S
Parameter Conditions
Min Typ Max Min Typ Max
Units
STATIC
Continuous 16 28 40 16 28 40 V
INPUT
Voltage4 Transient, 1 sec - - 50 - - 50 V
Inhibited - - 5 - - 5 mA
Current
No Load - 80 150 - 80 150 mA
Ripple Current Full Load, 20Hz to 10MHz - - 180 - - 200 mAp-p
Inhibit Pin Input4 0 - 1.5 0 - 1.5 V
Inhibit Pin Open Circuit Voltage4 9.0 11.0 14.0 9.0 11.0 14.0 V
UVLO Turn On 14.5 - 15.8 14.5 - 15.8 V
UVLO Turn Off4 14.0 - 15.0 14.0 - 15.0 V
VOUT TCASE = 25°C 3.25 3.30 3.35 4.925 5.00 5.075 V
OUTPUT
Voltage VOUT TCASE = -55°C to +100°C 3.217 3.30 3.383 4.875 5.00 5.125 V
Power3 0 - 66 0 - 100 W
Current3 VOUT 0 - 20 0 - 20 A
Ripple Voltage VOUT Full Load, 20Hz to 10MHz - - 150 - - 150 mVp-p
Line Regulation VOUT VIN = 16V to 40V - - 20 - - 20 mV
Load Regulation VOUT No Load to Full Load - - 50 - - 50 mV
Share Pin Voltage4 0 - 5 0 - 5 V
Current Share Accuracy4 - 5 - - 5 - %
EFFICIENCY 85 90 - 85 90 - %
Overload4 - - 24 - - 24 W
LOAD FAULT POWER DISSIPATION Short Circuit - - 24 - - 24 W
CAPACITIVE LOAD4 - - 1000 - - 1000
μF
SWITCHING FREQUENCY 230 260 290 230 260 290 kHz
VH-VL=5V
SYNC FREQUENCY RANGE Duty Cycle = 50% 240 - 325 240 - 325 kHz
ISOLATION 500 VDC 100 - - 100 - - MΩ
MTBF (MIL-HDBK-217F) GM @ TC = 55°C - 344 - - 344 - kHrs
DYNAMIC
Load Step Output Transient VOUT - - 250 - - 250 mVPK
Load Step Recovery2 Half Load to Full Load - - 300 - - 300
μSec
Line Step Output Transient4 VOUT - - 300 - - 300 mVPK
Line Step Recovery2, 4 VIN = 16V to 40V - - 150 - - 150
μSec
Turn On Delay VOUT - 4 10 - 4 10 mSec
Turn On Overshoot VIN = 0V to 28V - 0 15 - 0 25 mVPK
Notes: 1. Dependant on output voltage. 2. Time for output voltage to settle within 1% of its nominal value.
3. Derate linearly to 0 at 110°C. 4. Verified by qualification testing.
VPT100+2800S Series
DS90220B 3
SPECIFICATIONS (TCASE = -55°C to +100°C, VIN = +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous) 40 VDC Junction Temperature Rise to Case +17°C
Input Voltage (Transient, 1 second) 50 Volts Storage Temperature -55°C to +125°C
Output Power1 100 Watts Lead Solder Temperature (10 seconds) 300°C
Power Dissipation (Full Load, TCASE = +100°C) 18 Watts Weight (Maximum) 76 Grams
VPT100+2807S VPT100+2812S
Parameter Conditions
Min Typ Max Min Typ Max
Units
STATIC
Continuous 16 28 40 16 28 40 V
INPUT
Voltage4 Transient, 1 sec - - 50 - - 50 V
Inhibited - - 5 - - 5 mA
Current
No Load - 100 200 - 130 200 mA
Ripple Current Full Load, 20Hz to 10MHz - - 200 - - 200 mAp-p
Inhibit Pin Input4 0 - 1.5 0 - 1.5 V
Inhibit Pin Open Circuit Voltage4 9.0 11.0 14.0 9.0 11.0 14.0 V
UVLO Turn On 14.5 - 15.8 14.5 - 15.8 V
UVLO Turn Off4 14.0 - 15.0 14.0 - 15.0 V
VOUT TCASE = 25°C 6.895 7.00 7.105 11.82 12.0 12.18 V
OUTPUT
Voltage VOUT TCASE = -55°C to +100°C 6.825 7.00 7.175 11.70 12.0 12.30 V
Power3 0 - 100 0 - 100 W
Current3 VOUT 0 - 14.28 0 - 8.33 A
Ripple Voltage VOUT Full Load, 20Hz to 10MHz - - 150 - - 150 mVp-p
Line Regulation VOUT VIN = 16V to 40V - - 20 - - 50 mV
Load Regulation VOUT No Load to Full Load - - 70 - - 100 mV
Share Pin Voltage4 0 - 5 0 - 5 V
Current Share Accuracy4 - 5 - - 5 - %
EFFICIENCY 87 90 - 87 90 - %
Overload4 - - 24 - - 24 W
LOAD FAULT POWER DISSIPATION Short Circuit - - 24 - - 24 W
CAPACITIVE LOAD4 - - 1000 - - 500
μF
SWITCHING FREQUENCY 300 340 380 300 340 380 kHz
VH-VL=5V
SYNC FREQUENCY RANGE Duty Cycle = 50% 300 - 380 300 - 380 kHz
ISOLATION 500 VDC 100 - - 100 - - MΩ
MTBF (MIL-HDBK-217F) GM @ TC = 55°C - 344 - - 344 - kHrs
DYNAMIC
Load Step Output Transient VOUT - - 750 - - 500 mVPK
Load Step Recovery2 Half Load to Full Load - - 300 - - 300
μSec
Line Step Output Transient4 VOUT - - 750 - - 300 mVPK
Line Step Recovery2, 4 VIN = 16V to 40V - - 150 - - 150
μSec
Turn On Delay VOUT - 4 10 - 4 10 mSec
Turn On Overshoot VIN = 0V to 28V - 0 25 - 0 50 mVPK
Notes: 1. Dependant on output voltage. 2. Time for output voltage to settle within 1% of its nominal value.
3. Derate linearly to 0 at 110°C. 4. Verified by qualification testing.
VPT100+2800S Series
DS90220B 4
SPECIFICATIONS (TCASE = -55°C to +100°C, VIN = +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous) 40 VDC Junction Temperature Rise to Case +17°C
Input Voltage (Transient, 1 second) 50 Volts Storage Temperature -55°C to +125°C
Output Power1 100 Watts Lead Solder Temperature (10 seconds) 300°C
Power Dissipation (Full Load, TCASE = +100°C) 18 Watts Weight (Maximum) 76 Grams
VPT100+2815S VPT100+2828S
Parameter Conditions
Min Typ Max Min Typ Max
Units
STATIC
Continuous 16 28 40 16 28 40 V
INPUT
Voltage4 Transient, 1 sec - - 50 - - 50 V
Inhibited - - 5 - - 5 mA
Current
No Load - 130 200 - 30 100 mA
Ripple Current Full Load, 20Hz to 10MHz - - 200 - - 200 mAp-p
Inhibit Pin Input4 0 - 1.5 0 - 1.5 V
Inhibit Pin Open Circuit Voltage4 9.0 11.0 14.0 9.0 11.0 14.0 V
UVLO Turn On 14.5 - 15.8 14.5 - 15.8 V
UVLO Turn Off4 14.0 - 15.0 14.0 - 15.0 V
VOUT TCASE = 25°C 14.775 15.0 15.225 27.44 28.0 28.56 V
OUTPUT
Voltage VOUT TCASE = -55°C to +100°C 14.625 15.0 15.375 27.16 28.0 28.84 V
Power3 0 - 100 0 - 100 W
Current3 VOUT 0 - 6.67 0 - 3.57 A
Ripple Voltage VOUT Full Load, 20Hz to 10MHz - - 150 - - 300 mVp-p
Line Regulation VOUT VIN = 16V to 40V - - 50 - - 50 mV
Load Regulation VOUT No Load to Full Load - - 100 - - 100 mV
Share Pin Voltage4 0 - 5 0 - 5 V
Current Share Accuracy4 - 5 - - 5 - %
EFFICIENCY 87 91 - 85 88 - %
Overload4 - - 24 - - 24 W
LOAD FAULT POWER DISSIPATION Short Circuit - - 24 - - 28 W
CAPACITIVE LOAD4 - - 500 - - 500
μF
SWITCHING FREQUENCY 300 340 380 300 340 380 kHz
VH-VL=5V
SYNC FREQUENCY RANGE Duty Cycle = 50% 300 - 380 300 - 380 kHz
ISOLATION 500 VDC 100 - - 100 - - MΩ
MTBF (MIL-HDBK-217F) GM @ TC = 55°C - 344 - - 344 - kHrs
DYNAMIC
Load Step Output Transient VOUT - - 500 - - 1400 mVPK
Load Step Recovery2 Half Load to Full Load - - 300 - - 300
μSec
Line Step Output Transient4 VOUT - - 300 - - 1400 mVPK
Line Step Recovery2, 4 VIN = 16V to 40V - - 150 - - 300
μSec
Turn On Delay VOUT - 4 10 - 4 10 mSec
Turn On Overshoot VIN = 0V to 28V - 0 50 - 0 50 mVPK
Notes: 1. Dependant on output voltage. 2. Time for output voltage to settle within 1% of its nominal value.
3. Derate linearly to 0 at 110°C. 4. Verified by qualification testing.
VPT100+2800S Series
DS90220B 5
BLOCK DIAGRAM
UNDER
VOLTAGE
SHUT DOWN
PRIMARY
HOUSEKEEPING
SUPPLY
PWM
CONT ROL
VOLTAGE AND
CURRENT
AMPLIFIERS
PIN 1
28V IN
PIN 5
IN COM
Q1
+V OUT
PIN 10
PIN 6
OUT COM
INH PIN 3 FEEDBACK
MAGNETIC
SHARE
PIN 4
+S
PIN 9
-S
PIN 7
Q2
Q3
Current
Sense T1
SYNC PIN 2
TRIM
PIN 8
Note: Not applicable to VPT100+2828S
Figure 2
CONNECTION DIAGRAM
VPT100+2800S DC-DC CONVERTER
+
-
28 Vdc
5
28V OUT
3
OUT COM
1
28V IN
CASE
5
IN COM
3
INH
1
28V IN
10
+V OUT
6
OUT COM
LOAD
-S
7
+S
9
TRIM
8
2
SYNC
VPTF10-28 EMI FILTER
2
IN COM
4
CASE
4
SHARE
Figure 3
(Shown with optional EMI filter)
VPT100+2800S Series
DS90220B 6
PARALLEL CONNECTION DIAGRAMS
VPT100+2800S DC-DC CONVERT ER
+
-
28 Vdc
10
28V OUT
6
OUT COM
1
28V IN
4
IN COM
CASE
5
IN COM
3
INH
1
28V IN
10
+V OUT
6
OUT COM
LOAD
-S
7
+S
9
TRIM
8
2
SYNC
2
28V IN
7
OUT COM
VPTF20-28 EMI FILTER
5
IN COM
9
28V OUT
8
CASE
3
NC
4
SHARE
VPT100+2800S DC-DC CONVERT ER
5
IN COM
3
INH
1
28V IN
10
+V OUT
6
OUT COM
-S
7
+S
9
TRIM
8
2
SYNC
4
SHARE
VPT100+2800S DC-DC CONVERT ER
5
IN COM
3
INH
1
28V IN
10
+V OUT
6
OUT COM
-S
7
+S
9
TRIM
8
2
SYNC
4
SHARE
CASE
CASE
CASE
Figure 4 – Current Sharing Parallel Connection for Multiple Converters
(SYNC connection is optional)
VPT100+2800S Series
DS90220B 7
CONNECTION DIAGRAMS
5IN COM
3INH
128V IN
OPTIONAL
CAPACITOR
BIAS
11.5V
10K
Figure 5 –Inhibit Circuit
+
-
+
-
0.75V
Ri
30
10k
30
Rt
+V OUT
10
+S
9
TRIM
8
-S
7
OUT COM
6
(TRIM DOWN)
R-TRIM
(TRIM UP)
R-TRIM
(Shown with optional capacitor for turn-on delay) Figure 6 –Output Voltage Trim Circuit
OUTPUT VOLTAGE TRIM
The output voltage can be trimmed down by connecting a resistor between the TRIM pin and the +V OUT pin,
or can be trimmed up by connecting a resistor between the TRIM pin and the OUT COM pin as shown in
Figure 6. The maximum trim range is +10% up and –20% down. The appropriate resistor values versus the
output voltage are given in the trim table below.
VPT100+283R3S VPT100+2805S VPT100+2807S VPT100+2812S VPT100+2815S VPT100+2828S
+VOUT (V) RTRIM (Ω) +VOUT (V) RTRIM (Ω) +VOUT (V) RTRIM (Ω) +VOUT (V) RTRIM (Ω) +VOUT (V) RTRIM (Ω) +VOUT (V) RTRIM (Ω)
3.60 3.94k 5.5 980 7.7 714 13.2 1.14k 16.50 686 30.5 720
3.55 8.92k 5.4 4.72k 7.5 5.00k 13.0 2.39k 16.25 1.69k 30.0 1.46k
3.50 16.4k 5.3 10.9k 7.3 15.0k 12.8 4.26k 16.00 3.19k 29.5 2.68k
3.45 28.8k 5.2 23.4k 7.1 65.0k 12.6 7.39k 15.75 5.7k 29.0 5.12k
3.40 53.5k 5.1 60.5k 7.0 — 12.4 13.6k 15.50 10.7k 28.5 12.3k
3.35 127k 5.0 -- 6.9 605k 12.2 32.4k 15.25 25.9k 28.0 --
3.30 -- 4.9 404k 6.7 188k 12.0 -- 15.00 -- 27.5 551k
3.25 486k 4.8 189k 6.5 105k 11.8 548k 14.75 552k 27.0 265k
3.20 226k 4.7 118k 6.3 69.3k 11.6 266k 14.50 270k 26.5 171k
3.15 140k 4.6 82.4k 6.1 49.4k 11.4 172k 14.25 175k 26.0 125k
3.10 96.9k 4.5 61.1k 5.9 36.8k 11.2 126k 14.00 128k 25.5 97.4k
3.05 71.3k 4.4 46.9k 5.7 28.1k 11.0 97.4k 13.75 99.5k 25.0 79k
3.00 54.2k 4.3 36.8k 5.6 24.6k 10.8 78.6k 13.50 80.6k 24.5 65.9k
2.95 42k 4.2 29.2k 10.6 65.3k 13.25 67k 24.0 56.1k
2.90 32.8k 4.1 23.3k 10.4 55.2k 13.00 56.9k 23.5 48.5k
2.85 25.7k 4.0 18.5k 10.2 47.4k 12.75 49k 23.0 42.4k
2.80 20.1k 10.0 41.1k 12.50 42.6k 22.5 37.4k
2.75 15.4k 9.8 36k 12.25 37.5k
2.70 11.5k 9.6 31.8k 12.00 33.2k
2.65 8.26k
VPT100+2800S Series
DS90220B 8
EFFICIENCY PERFORMANCE CURVES (TCASE = 25°C, Full Load, Unless Otherwise Specified)
V
IN = 16V VIN = 28V VIN = 40V
75
80
85
90
95
0224466
Output Pow er (W)
Efficiency (%)
75
80
85
90
95
0 25 50 75 100
Output Pow er (W)
Efficiency (%)
Figure 7 – VPT100+283R3S Figure 8 – VPT100+2805S
Efficiency (%) vs. Output Power (W) Efficiency (%) vs. Output Power (W)
75
80
85
90
95
0255075100
Output Power (W)
Efficiency (%)
75
80
85
90
95
0 25 50 75 100
Output Pow er (W)
Efficiency (%)
Figure 9 – VPT100+2807S Figure 10 – VPT100+2812S
Efficiency (%) vs. Output Power (W) Efficiency (%) vs. Output Power (W)
VPT100+2800S Series
DS90220B 9
EFFICIENCY PERFORMANCE CURVES (TCASE = 25°C, Full Load, Unless Otherwise Specified)
V
IN = 16V VIN = 28V VIN = 40V
75
80
85
90
95
0 25 50 75 100
Output Pow er (W)
Efficiency (%)
75
80
85
90
95
10 35 60 85
Output Power (W)
Efficiency (%)
Figure 11 – VPT100+2815S Figure 12 – VPT100+2828S
Efficiency (%) vs. Output Power (W) Efficiency (%) vs. Output Power (W)
VPT100+2800S Series
DS90220B 10
EMI PERFORMANCE CURVES
(TCASE = 25°C, VIN = +28V ± 5%, Full Load, Unless Otherwise Specified)
Emission Level [dBμA]
MIL-STD-461C CE03
Narrowband
80
60
40
20
0
0.01 0.1
Frequency [MHz]
1
Emission Level [dBμA]
MIL-STD-461C CE03
Narrowband
40
30
20
10
0
1 10 50
Frequency [MHz]
Figure 13 – VPT100+2800S without EMI Filter Figure 14 – VPT100+2800S with VPTF Series EMI Filter
Emission Level [dBμV]
MIL-STD-461E CE102
Narrowband
90
70
50
30
10
0.01 0.1
Frequency [MHz]
.25
Emission Level [dBμV]
MIL-STD-461E CE102
Narrowband
90
70
50
30
10
0.1 1 10
Frequency [MHz]
Figure 15 – VPT100+2800S without EMI Filter Figure 16 – VPT100+2800S with VPTF Series EMI Filter
VPT100+2800S Series
DS90220B 11
PACKAGE SPECIFICATIONS
Top View Side View
Bottom View
Figure 17 – Package and Pinout
(Dimensional Limits are ±0.005” Unless Otherwise Stated)
Package Notes:
1. Case temperature is measured on the center of the baseplate surface.
2. Materials: Baseplate – aluminum, conductive conversion coating.
Cover – nickel plated.
Pins – copper, gold over nickel plating.
3. Mounting holes are not threaded. Recommended fastener is 4-40.
PIN FUNCTION
1 28V IN
2 SYNC
3 INHIBIT
4 SHARE
5 IN COM
6 OUT COM
7 -SENSE
8 TRIM
9 +SENSE
10 +V OUT
VPT100+2800S Series
DS90220B 12
PACKAGE PIN DESCRIPTION
Pin Function Description
1 28VIN Positive Input Voltage Connection
2 SYNC Input Synchronization Signal. TTL squarewave, 5Vpp, 20 - 80% duty cycle,
internally capacitively coupled.
3 INHIBIT
This is an open collector input. Logic Low = Disabled Output. Connect the inhibit
pin to input common to disable the output. Unconnected, open collector or open
drain = Enabled Output.
4 SHARE Current Share Connection
5 INCOM Input Return Connection
6 OUTCOM Output Return Connection
7 -SENSE Output Return Remote Sense. Compensate for up to 0.5V total drop (positive and
return).
8 TRIM Trim Output Voltage to +10%, -20% of Nominal Value. Leave open if not used.
9 +SENSE Positive Output Voltage Remote Sense. Compensate for up to 0.5V total drop
(positive and return).
10 +V OUT Positive Output Voltage Connection
100% ENVIRONMENTAL SCREENING
Screening Condition
Internal Visual IPC-A-610
Stabilization Bake MIL-STD-883, Method 1008, Condition B, 125°C, 24 hours
Temperature Cycling MIL-STD-883, Method 1010, Condition B, -55°C to +125°C, 10 Cycles
Burn-In MIL-STD-883, Method 1015, 96 hours at +100°C
Final Electrical 100% at 25°C
External Visual MIL-STD-883, Method 2009
VPT100+2800S Series
DS90220B 13
ORDERING INFORMATION
VPT100+ 28 05 S
1 2 3 4
(1) (2) (3) (4)
Product Series Nominal Input Voltage Output Voltage Number of Outputs
VPT100+
28
28 Volts
3R3
05
07
12
15
28
3.3 Volts
5 Volts
7 Volts
12 Volts
15 Volts
28 Volts
S
Single
CONTACT INFORMATION
To request a quotation or place orders please contact your sales representative or the VPT Inc. Sales
Department at:
Phone: (425) 353-3010
Fax: (425) 353-4030
E-mail: vptsales@vpt-inc.com
All information contained in this datasheet is believed to be accurate, however, no responsibility is assumed for possible errors
or omissions. The products or specifications contained herein are subject to change without notice.
